From: Peter Zijlstra <peterz@infradead.org>
To: David Laight <David.Laight@aculab.com>
Cc: 'Linus Torvalds' <torvalds@linux-foundation.org>,
Al Viro <viro@zeniv.linux.org.uk>,
kernel test robot <oliver.sang@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
LKML <linux-kernel@vger.kernel.org>,
"lkp@lists.01.org" <lkp@lists.01.org>,
kernel test robot <lkp@intel.com>,
"Huang, Ying" <ying.huang@intel.com>,
Feng Tang <feng.tang@intel.com>,
"zhengjun.xing@intel.com" <zhengjun.xing@intel.com>
Subject: Re: [x86] d55564cfc2: will-it-scale.per_thread_ops -5.8% regression
Date: Fri, 8 Jan 2021 10:51:56 +0100 [thread overview]
Message-ID: <X/grPFTgOMvtqEVZ@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <824461ae2cb642b1b2f82fac140a98da@AcuMS.aculab.com>
On Fri, Jan 08, 2021 at 09:37:45AM +0000, David Laight wrote:
> The lack of spinlocks in userspace really kills you.
Glibc has them, but please don't complain about lock holder preemption
issues if you do actually use them ;-)
next prev parent reply other threads:[~2021-01-08 9:52 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-07 13:47 [x86] d55564cfc2: will-it-scale.per_thread_ops -5.8% regression kernel test robot
2021-01-07 17:43 ` Linus Torvalds
2021-01-07 18:33 ` Al Viro
2021-01-07 18:40 ` Al Viro
2021-01-07 18:55 ` Al Viro
2021-01-07 18:47 ` Linus Torvalds
2021-01-07 18:58 ` Al Viro
2021-01-07 19:04 ` Al Viro
2021-01-07 19:33 ` Linus Torvalds
2021-01-07 19:57 ` Al Viro
2021-01-08 9:29 ` David Laight
2021-01-08 9:37 ` David Laight
2021-01-08 9:51 ` Peter Zijlstra [this message]
2021-01-08 10:44 ` David Laight
2021-01-08 9:49 ` David Laight
2021-01-08 6:13 ` Oliver Sang
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